IR Sensor5 (Infrared Sensor) PDF

IR sensor5 (infrared sensor) WHAT IS INFRARED? - Infrared radiation is a form of light similar to the light we see all around us. The only difference between IR light and visible light is the frequency and wavelength. Infrared radiation lies outside the range of visible light, so hu...

IR sensor5 (infrared sensor) WHAT IS INFRARED? - Infrared radiation is a form of light similar to the light we see all around us. The only difference between IR light and visible light is the frequency and wavelength. Infrared radiation lies outside the range of visible light, so humans can't see it: - Because IR is a type of light, IR communication requires a direct line of sight from the receiver to the transmitter. It can't transmit through walls or other materials like WiFi or Bluetooth. - HOW IR REMOTES AND RECEIVERS WORK - A typical infrared communication system requires an IR transmitter and an IR receiver. The transmitter looks just like a standard LED, except it produces light in the IR spectrum instead of the visible spectrum. If you have a look at the front of a TV remote, you'll see the IR transmitter LED - The same type of LED is used in IR transmitter breakout boards for the Arduino. You can see it at the front of this Keyes IR transmitter: - IR SENSOR USING IR RECIEVER SENSOR (VS 1838B) - The VS1838B is a popular IR receiver sensor commonly used for remote control detection and other IR applications. Including an image of the VS1838B can help the audience identify this specific sensor. - The VS1838B is designed to receive infrared signals transmitted by remote controls or other IR emitters. It works by converting the incoming infrared radiation into an electrical signal that can be processed by a microcontroller or other electronic circuitry. - COMPONENTS OF THE VS1838B IR RECEIVER - **HOW** **IT WORKS TOGETHER TO DETECT AND DECODE IR:** - **1.Photodiode**: - - \- This is the heart of the IR receiver, converting incoming IR light into an electrical signal. - \- It\'s a semiconductor device that generates a small current when exposed to infrared radiation. - \- The amount of current generated is proportional to the intensity of the IR light. - \- The photodiode is typically made of silicon or germanium and is highly sensitive to specific wavelengths of IR light. - - **2.Preamplifier**: - - \- The photodiode generates a very weak signal, which needs to be amplified before further processing. - \- The preamplifier boosts the signal strength, making it suitable for decoding. - \- This amplification is crucial for reliable detection of IR signals, especially in noisy environments. - **3. Bandpass Filter:** - - \- The IR receiver needs to filter out unwanted signals and noise. - \- The bandpass filter is designed to pass only the specific frequency of IR signals used by the remote control (typically 38 kHz). - \- This filtering helps to ensure that only the intended IR signals are detected and processed. - - **4. Demodulator:** - - \- The demodulator extracts the data encoded in the IR signal. - \- It converts the modulated IR signal back into a digital format that can be understood by a microcontroller or other electronic circuitry. - \- This process involves extracting the timing and duration of pulses in the IR signal, which represent the data bits. - **5. Signal Conditioning Circuitry:** - - \- This circuitry further processes the demodulated signal, ensuring it\'s clean and reliable. - \- It may include features like noise reduction, signal shaping, and level shifting to make the signal compatible with the microcontroller or other connected devices. - - **6. Output:** - - \- The final output of the IR receiver is a digital signal that represents the decoded data from the IR signal. - \- This signal can be used to control various devices, like TVs, air conditioners, or other appliances. - CONNECTING THE VS1838B TO ARDUINO - **Connections**: - - \- **Red Wire**: Connects the positive (+) terminal of the power supply (typically 5V) to the VCC pin of the Arduino Uno board. - \- **Blue Wire**: Connects the signal out pin of the Arduino Uno. - \- **Black Wire**: Connects the negative (-) terminal of the power supply to the GND pin of the Arduino Uno board. - DECODING VS1838B IR CODE - \#include \ - const int RECV\_PIN = 2; // IR receiver pin connected to digital pin 2 - IRrecv irrecv(RECV\_PIN); // Create an IR receiver object - decode\_results results; // Create a decode\_results object to store the decoded IR code - void setup() { - Serial.begin(9600); // Initialize serial communication - irrecv.enableIRIn(); // Enable the IR receiver - } - void loop() { - if (irrecv.decode(&results)) { // Check if an IR code was received - Serial.print(\"Received code: \"); - Serial.println(results.value, HEX); // Print the decoded IR code in hexadecimal format - // Decode and assign actions to specific IR codes using if statements - if (results.value == 0x45) { // Example: Power button - Serial.println(\"Power button pressed\"); - // Perform actions for the power button - } else if (results.value == 0x46) { // Example: Volume up button - Serial.println(\"Volume up button pressed\"); - // Perform actions for the volume up button - } else if (results.value == 0x47) { // Example: Volume down button - Serial.println(\"Volume down button pressed\"); - // Perform actions for the volume down button - } - // \... add more commands and actions \... - irrecv.resume(); // Resume receiving IR codes - } - } - keys and their corresponding codes from the remote Find the Protocol Used by Your Remote Knowing which protocol your remote uses can be useful if you want to work on some more advanced projects. Or you might just be curious. The program below will identify the protocol used by your remote. It should even work on most of the remote controls around your house. Sample Applications and Projects with the VS1838B Remote-Controlled Robot: \- Functionality: The VS1838B can be used to receive commands from a remote control, allowing you to control the movement and actions of a robot. \- Implementation: Connect the VS1838B to an Arduino or other microcontroller. Program the microcontroller to decode the IR signals and translate them into motor commands for the robot. \- Example: A simple robot that can move forward, backward, turn left, and turn right based on button presses on a remote control. \- Limitations: The range of the IR signal is limited, and interference from ambient light can occur. Trial challenge \#include \ const int RECV\_PIN = 7; IRrecv irrecv(RECV\_PIN); decode\_results results; const int redPin = 10; const int greenPin = 11; void setup(){ irrecv.enableIRIn(); irrecv.blink13(true); pinMode(redPin, OUTPUT); pinMode(greenPin, OUTPUT); } void loop(){ if (irrecv.decode(&results)){ if (results.value == 0xFF38C7){ //Keypad button \"5\" digitalWrite(redPin, HIGH); delay(2000); digitalWrite(redPin, LOW); } if (results.value == 0xFF18E7){ //Keypad button \"2\" digitalWrite(greenPin, HIGH); delay(2000); digitalWrite(greenPin, LOW); } irrecv.resume(); } }